XIV, 6 Uichanco: Philippine Plant Galls 547 
Average diameter, 2 millimeters; average depth of concavity, 
0.5. 
Luzon, Laguna, College of Agriculture, Los Banos, at an al- 
titude of about 45 meters. January, 1918. Type gall No. 18174, 
College of Agriculture collection. 
Galls very common; insects observed in the adult stage only 
in January. 
GALLS CAUSED BY THYSANOPTERA 
Dillenia reiffexscheidia F.-Vill. Dilleniacese. 
Leaf galls. Causal thrips collected but not identified. 
Leaf margins wholly or partially involute toward nether sur- 
face of leaf; when partially so, the involution usually extends 
from apex, leaving a basal fraction of the leaf unaffected. Mi- 
nute, red, irregular, hard papules more prominent on upper 
surface or at the continuation of the latter in the roll than on 
nether surface. Thrips in different stages found within the 
rolls of younger leaves. 
Average diameter of roll, 8 millimeters. 
Luzon, Laguna, College of Agriculture, lower nursery, Los 
Banos, at an altitude of about 43 meters. October, 1917. Type 
gall No. 18158, College of Agriculture collection. 
These galls are apparently confined to a single isolated tree 
at the bank of Molauin Creek in the place cited. None of these 
materials was found elsewhere. 
Ficus ulmifolia Lam. Moracese. 
Leaf galls caused by Gigantothrips elegans Zimmerman.^® 
Part of leaf margin involuted or deflected. Small, irregular, 
reddish dots, bounded by irregular, yellow areas, visible on 
both surfaces. Insects found on nether surface of leaf. 
Luzon, Laguna, College of Agriculture, Los Banos, at alti- 
tudes of 45 to 100 meters. January, 1918. Gall No. 18403, 
College of Agriculture collection. 
These galls are abundant during the greater part of the year. 
Garcinia venulosa (Blanco) Choisy. Guttiferse. 
Leaf galls. Thrips collected but not identified. 
Open; a carinate structure formed by the superior involution 
of a part of submarginal portion of leaf ; paler green than leaf ; 
“ The insect has been reported from Java as making similar galls on 
the leaves of various other species of Ficus. See Leeuwen-Reijnvaan, Bei- 
trage zur Kenntniss der Gallen von Java, Pt. V, Bull. -Jard. Bot. Buitenzorg 
II 10 (1913). 
